When you receive a 500 error that is coming back from WCF send port, the send port is not suspended but instead completes successfully. This is inconsistent with the behavior of this same adapter when error 400 comes back and is also inconsistent with the behavior of other HTTP-based adapters which suspend the send port instance when error 500 is sent back. This behavior also prevents you from catching the exception in the orchestration in the case of a 500 error.
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